3
A fish farmer stocked two ponds (A, B) with 20 fish each (mix of male and female). He
measured the population size of each pond over time. The data are shown in the graph.
1600
1400
1200
1000
Population size
800
400
Population A
Population B
200
15
20
10
Generation
Which hypothesis BEST explains the difference in the sizes of the two fish populations?
A
Pond A has the same temperature as Pond B.
B
Pond B has more available food than Pond A.
C
Pond A started with more fish than pond B.
D
Pond A has more available food than Pond B.